Changes the active row of @combo_box to the one that has an ID equal to
@active_id, or unsets the active row if @active_id is %NULL. Rows having
a %NULL ID string cannot be made active by this function.
If the #GtkComboBox:id-column property of @combo_box is unset or if no
row has the given ID then the function does nothing and returns %FALSE.
Changes the active row of @combo_box to the one that has an ID equal to @active_id, or unsets the active row if @active_id is %NULL. Rows having a %NULL ID string cannot be made active by this function.
If the #GtkComboBox:id-column property of @combo_box is unset or if no row has the given ID then the function does nothing and returns %FALSE.